Raise toilet seatFlush bowl and remove heavy soil by scrubbing with a stiff brush prior to using this productPoint top of bottle down into bowlSqueeze gently, at least 4oz (squeeze approximately 15 seconds) of the thick formula under the rim and on the sides of the bowl, letting it run down into the waterDo not close the toilet bowl lidBrush the entire bowl even under the rim

To clean lime scale:

Let stand for 1 minute

To clean rust stains:

Pre-clean surfaceLet stand for 10 minutesFlushRinse brush in fresh bowl water after each use